sql - 与 FOREIGN KEY 约束冲突

Question

我有两张 table

学术界:

CREATE TABLE [dbo].[R_ACADEMIE](
    [ID_ACADEMIE] [dbo].[IDENTIFIANT] NOT NULL,
    [LC_ACADEMIE_CODE] [dbo].[LIBELLE_COURT] NOT NULL,
    [LM_ACADEMIE_LIBELLE] [dbo].[LIBELLE_MOYEN] NOT NULL,
 CONSTRAINT [PK_R_ACADEMIE] PRIMARY KEY NONCLUSTERED 
(
    [ID_ACADEMIE] ASC
)WITH (PAD_INDEX = OFF, STATISTICS_NORECOMPUTE = OFF, IGNORE_DUP_KEY = OFF, ALLOW_ROW_LOCKS = ON, ALLOW_PAGE_LOCKS = ON) ON [PRIMARY]
) ON [PRIMARY]
GO

我在 E_VOYAGEUR 表中添加了我的列

ALTER TABLE E_VOYAGEUR ADD ID_ACADEMIE IDENTIFIANT NOT NULL DEFAULT 0;

我想在我的 E_VOYAGEUR 表上创建一个 FK，我这样做:

ALTER TABLE [dbo].[E_VOYAGEUR]  WITH CHECK ADD  CONSTRAINT [FK_E_VOYAGE_A_VOYAGEU_E_ACADEMIE] FOREIGN KEY([ID_ACADEMIE])
REFERENCES [dbo].[R_ACADEMIE] ([ID_ACADEMIE])
GO

我遇到此错误:

The ALTER TABLE statement is in conflict with the FOREIGN KEY constraint " FK_E_VOYAGE_A_VOYAGEU_E_ACADEMIE " . The conflict occurred in database " DEV ", " dbo.R_ACADEMIE " table, column ' ID_ACADEMIE ' .

Answer 1

似乎您的表 E_VOYAGEUR 已经有一些值，并且您正在更改该表以添加新列 ID_ACADEMIE，默认值为 0。 这使得表 E_VOYAGEUR 中的所有行的列 ID_ACADEMIE 的值为 0。当您使用外键约束添加到该表(引用表)时，[R_ACADEMIE] 在 ID_ACADEMIE 列中可能没有值为“0”的条目，这似乎是此问题的原因。

在将外键添加到表 E_VOYAGEUR 之前，请确保 ID_ACADEMIE 列中的值在表 [R_ACADEMIE] 中有引用。